Humans stumble upon an "abandoned" Shinto shrine that is guarded by Yokai

An old couple dies. Leaving their massive withering manner to their nurse for many years and only descendent. But a curse lies over this house. A haunted music box that belonged to the first child that was born and then died here. Looks like she wants a play mate. Is it lonely love or obsession?

A scientist promises a large sum of money for those willing to participate in what they describe as a harmless social experiment. But what is the real reason they are here?